You can tell a lot about a person from their Instagram account — what they like to eat, what they like to wear, and maybe even what their mental health is like. That’s right: Researchers say that Instagram photos can help predict who may have depression. But the signs probably aren’t what you think they’d be. In a study involving 166 Instagram users and over 40,000 photos, researchers tested out a machine learning program that analyzed the photos, looking for signs of depression. The algorithms considered a wide variety of factors, ranging from facial expression to composition to color hue; and as it turns out, they were surprisingly effective in predicting which users had depression. In fact, their success rate held even when looking at photos posted by people with…